As you can see, for each region there is a subset of machine types. If you need to raise a core limit, you need to raise an Azure support ticket and request an increase for the required region and VM type. This does not cost anything and from my experience is usually done within 24 hours.

Hopefully this helps some folk out there who come across this issue. If you haven’t seen this yet and are planning an Azure rollout, it would be worth requesting this increase prior to starting your project!